As some test tiles just came out of the kiln, it is a perfect opportunity to tell you about it.
First, about the test tiles:
This is my extruder die ( for 2 different extruders):
When I extrude the tiles, I score a line at the bottom of the vertical surface, just above the angle. That makes it easy to break the bottom off for filing:
Once I forgot to do the score line and had to use the angle grinder for this step.
I store the tiles on A4 size 3 mm thick MDF board fitted with stapled elastic on both sides:
I use the same format to write the recipes on the A4 page, and that way I have clear visual reference: